<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    #d1{
      color: red;

    }
    /*优先级:选择器作用范围越小,优先级越高*/
    div{
      color: #0aa1ed !important;
      background-color: blanchedalmond;
    }
    a{
      text-decoration:none ;
    }
  </style>
</head>
<body>
<div id="d1">
  <p>这是p标签</p>
  <span>这是span标签</span>
  <a href="">超链接</a>

</div>
</body>
</html>